Remember !

	A
The fractions have the following form
	B

Where A is the numerator and B is the denominator.

The difference of two or more fractions which have the same denominator is computed by substractint the one numerator from another and copying the denomintaor.

If we do not have the same denominator, we must bring the fractions to same denominator by multiplying together the two denominators.

Exemple !

4		1		3
	-		=
7		7		7